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TAN Wenjuan,CHEN Yandong,YANG Ling,ZHOU Xiaoping,ZHOU Leming,TANG Jie.Energy Coordinated Control Method for DC Microgrid with Photovoltaic[J].JOURNAL OF POWER SUPPLY,2018,16(2):76-85
Energy Coordinated Control Method for DC Microgrid with Photovoltaic
Received:November 30, 2017  Revised:January 30, 2018
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DOI:10.13234/j.issn.2095-2805.2018.2.76
Keywords:DC microgrid  energy management  photovoltaic generation  hybrid energy storage
Fund Project:The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)
                 
AuthorInstitutionEmail
TAN Wenjuan National Electric Power Conversion and Control Engineering Technology Research Center, Hunan University, Changsha , China
CHEN Yandong National Electric Power Conversion and Control Engineering Technology Research Center, Hunan University, Changsha , China yandong_chen@hnu.edu.cn
YANG Ling National Electric Power Conversion and Control Engineering Technology Research Center, Hunan University, Changsha , China
ZHOU Xiaoping National Electric Power Conversion and Control Engineering Technology Research Center, Hunan University, Changsha , China
ZHOU Leming National Electric Power Conversion and Control Engineering Technology Research Center, Hunan University, Changsha , China
TANG Jie Hunan Provincial Key Laboratory of Grids Operation and Control on Multi-power Sources Area, Shaoyang University, Shaoyang , China
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Abstract:
      The stochastic volatility of distributed power output from DC microgrid not only causes a large range of DC bus voltage fluctuations, but also affects the stable operation of the system. To solve this problem, an energy coordinated control method for DC microgrid with photovoltaic(PV) and hybrid energy storage(HES)is proposed in this paper, which achieves the rapid suppression of bus voltage fluctuations caused by the power imbalance between supply and demand. This method gives priority to the use of new energy sources for load power supply. By setting the working thresholds of grid converter and energy storage module to coordinate and manage the energy flow among modules, the frequent actions of power electronic devices due to the small range of fluctuations of DC bus voltage can be avoided, realizing the optimal use of energy. In the on-grid operation, the DC microgrid exchanges power with the large grid through grid converter; in the off-grid operation, the PV module and HES module coordinate to supply power for the local loads. In the second operation, with the consideration of the charging/discharging margins of HES module as well as the characteristics of super capacitors(i.e., large power density) and lithium batteries(i.e., large energy density), the HES module ma-kes the super capacitor work first to balance the instantaneous power of the system, which improves the system's dynamic response characteristics, reduces the actions of lithium batteries, and extends their service life. After lithium batteries start to work, they can coordinate with super capacitors to adjust the DC bus voltage to prevent the super capacitors from reaching saturation too fast. Simulation results verify the effectiveness of the proposed method.
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